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Lucene example source code file (PositionIncrementAttributeImpl.java)

This example Lucene source code file (PositionIncrementAttributeImpl.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

attributeimpl, cloneable, illegalargumentexception, increment, increment, io, override, override, positionincrementattribute, positionincrementattribute, positionincrementattributeimpl, positionincrementattributeimpl, serializable

The Lucene PositionIncrementAttributeImpl.java source code

package org.apache.lucene.analysis.tokenattributes;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.Serializable;

import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.util.AttributeImpl;

/** The positionIncrement determines the position of this token
 * relative to the previous Token in a {@link TokenStream}, used in phrase
 * searching.
 *
 * <p>The default value is one.
 *
 * <p>Some common uses for this are:
    * * <li>Set it to zero to put multiple terms in the same position. This is * useful if, e.g., a word has multiple stems. Searches for phrases * including either stem will match. In this case, all but the first stem's * increment should be set to zero: the increment of the first instance * should be one. Repeating a token with an increment of zero can also be * used to boost the scores of matches on that token. * * <li>Set it to values greater than one to inhibit exact phrase matches. * If, for example, one does not want phrases to match across removed stop * words, then one could build a stop word filter that removes stop words and * also sets the increment to the number of stop words removed before each * non-stop word. Then exact phrase queries will only match when the terms * occur with no intervening stop words. * * </ul> */ public class PositionIncrementAttributeImpl extends AttributeImpl implements PositionIncrementAttribute, Cloneable, Serializable { private int positionIncrement = 1; /** Set the position increment. The default value is one. * * @param positionIncrement the distance from the prior term */ public void setPositionIncrement(int positionIncrement) { if (positionIncrement < 0) throw new IllegalArgumentException ("Increment must be zero or greater: " + positionIncrement); this.positionIncrement = positionIncrement; } /** Returns the position increment of this Token. * @see #setPositionIncrement */ public int getPositionIncrement() { return positionIncrement; } @Override public void clear() { this.positionIncrement = 1; } @Override public boolean equals(Object other) { if (other == this) { return true; } if (other instanceof PositionIncrementAttributeImpl) { return positionIncrement == ((PositionIncrementAttributeImpl) other).positionIncrement; } return false; } @Override public int hashCode() { return positionIncrement; } @Override public void copyTo(AttributeImpl target) { PositionIncrementAttribute t = (PositionIncrementAttribute) target; t.setPositionIncrement(positionIncrement); } }

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